(b) it is made before the end of the period of sixteen months beginning immediately following the date of filing of the earlier relevant application (or if there is more than one, the earliest of them) specified in that, or any earlier, declaration [not extendable: Schedule 4]; and

(c) the condition in paragraph (3) is met.

(3) The condition is that-

(a) the applicant has not made a request under section 16(1) for publication of the application during the period prescribed for the purposes of that section; or

(b) any request made was withdrawn before preparations for the application's publication have been completed by the Patent Office.